body{margin:0;padding:0;transition:background-color .3s ease,color .3s ease}body.dark-theme{background-color:#121212;color:#fff}body.dark-theme .cell{border-color:#666;background-color:#2a2a2a;color:#fff}body.dark-theme .cell:hover{background-color:#3a3a3a}body.dark-theme .theme-toggle{border-color:#666;color:#fff}body.dark-theme .theme-toggle:hover{background-color:#ffffff1a}body.dark-theme button{background-color:#444}body.dark-theme button:hover{background-color:#555}